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From: "jskumari at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96017] Powerpc suboptimal register spill in likely path
Date: Fri, 24 Nov 2023 08:46:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96017

--- Comment #13 from Surya Kumari Jangala <jskumari at gcc dot gnu.org> ---
With the patch at
https://gcc.gnu.org/pipermail/gcc-patches/2023-October/631849.html, the
testcase gets shrink wrapped. This is the assembly produced:

        addis 2,12,.TOC.-.LCF0@ha
        addi 2,2,.TOC.-.LCF0@l
        lwz %r10,0(%r3)
        addis %r9,%r2,.LC0@toc@ha
        ld %r9,.LC0@toc@l(%r9)
        cmpwi %cr0,%r10,0
        lwz %r9,0(%r9)
        bne %cr0,.L11
        extsw %r3,%r9
        blr
.L11:
        mflr %r0
        std %r0,16(%r1)
        stdu %r1,-48(%r1)
        stw %r9,32(%r1)
        bl slowpath
        nop
        lwz %r9,32(%r1)
        addi %r1,%r1,48
        ld %r0,16(%r1)
        extsw %r3,%r9
        mtlr %r0
        blr=